MLA

The Curious Zebra Alive from America! Walk in Gem'Men and Ladies, Walk in. [Graphic]. Printed for G. Johnson as the Act directs 3 Sept. 1778, and sold at all the printshops in London & Westminster, 0AD. https://collections.library.yale.edu/catalog/10723206.

APA, 6th edition

The curious zebra alive from America! walk in gem'men and ladies, walk in. [graphic]. (0 C.E.). [Political cartoons England 1778, Satires (Visual works) England 1778, Etchings England 1778, Engravings England 1778]. Printed for G. Johnson as the Act directs 3 Sept. 1778, and sold at all the printshops in London & Westminster. https://collections.library.yale.edu/catalog/10723206.